As suggested contacting the listing agent is the best way to get pictures removed.
However since the property was on the MLS the information will have spread to dozens of 3rd party sites and to every agent's website which has an IDX property feed. The vast majority will automatically clear with time but once something appears on the internet, there can be traces of it for many years.
Typing 781 Encina Grande into a internet search shows that the 23 pictures have spread far beyond the MLS and Trulia. The pictures do not get automatically updated because of a change to the MLS but normally disappear with time.
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